Change the visual appearance of panel on GTK per new UI design.

chrome/browser/ui/panels/panel_browsertest.cc

Index: chrome/browser/ui/panels/panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_browsertest.cc b/chrome/browser/ui/panels/panel_browsertest.cc
index 0ac8e140da582acf1b7f067bb3a54514cacd62bf..0595764e4daa52313c117c658acbe4f3c2d8c517 100644
--- a/chrome/browser/ui/panels/panel_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_browsertest.cc
@@ -291,26 +291,17 @@ IN_PROC_BROWSER_TEST_F(PanelBrowserTest, CheckDockedPanelProperties) {
   EXPECT_TRUE(panel2->always_on_top());
   EXPECT_TRUE(panel3->always_on_top());
 
-  EXPECT_TRUE(panel1_testing->IsButtonVisible(
-      NativePanelTesting::CLOSE_BUTTON));
-  EXPECT_TRUE(panel2_testing->IsButtonVisible(
-      NativePanelTesting::CLOSE_BUTTON));
-  EXPECT_TRUE(panel3_testing->IsButtonVisible(
-      NativePanelTesting::CLOSE_BUTTON));
-
-  EXPECT_TRUE(panel1_testing->IsButtonVisible(
-      NativePanelTesting::MINIMIZE_BUTTON));
-  EXPECT_FALSE(panel2_testing->IsButtonVisible(
-      NativePanelTesting::MINIMIZE_BUTTON));
-  EXPECT_FALSE(panel3_testing->IsButtonVisible(
-      NativePanelTesting::MINIMIZE_BUTTON));
-
-  EXPECT_FALSE(panel1_testing->IsButtonVisible(
-      NativePanelTesting::RESTORE_BUTTON));
-  EXPECT_TRUE(panel2_testing->IsButtonVisible(
-      NativePanelTesting::RESTORE_BUTTON));
-  EXPECT_TRUE(panel3_testing->IsButtonVisible(
-      NativePanelTesting::RESTORE_BUTTON));
+  EXPECT_TRUE(panel1_testing->IsButtonVisible(panel::CLOSE_BUTTON));
+  EXPECT_TRUE(panel2_testing->IsButtonVisible(panel::CLOSE_BUTTON));
+  EXPECT_TRUE(panel3_testing->IsButtonVisible(panel::CLOSE_BUTTON));
+
+  EXPECT_TRUE(panel1_testing->IsButtonVisible(panel::MINIMIZE_BUTTON));
+  EXPECT_FALSE(panel2_testing->IsButtonVisible(panel::MINIMIZE_BUTTON));
+  EXPECT_FALSE(panel3_testing->IsButtonVisible(panel::MINIMIZE_BUTTON));
+
+  EXPECT_FALSE(panel1_testing->IsButtonVisible(panel::RESTORE_BUTTON));
+  EXPECT_TRUE(panel2_testing->IsButtonVisible(panel::RESTORE_BUTTON));
+  EXPECT_TRUE(panel3_testing->IsButtonVisible(panel::RESTORE_BUTTON));
 
   EXPECT_EQ(panel::RESIZABLE_ALL_SIDES_EXCEPT_BOTTOM,
             panel1->CanResizeByMouse());